SU1392350A1 - Device for measuring angular displacements - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to expand the range of measured angular displacements up to О ... 360 degrees. and the increase in measurement accuracy, which is achieved due to the fact that the calibration characteristic in the range of 0 ... .360 degrees, is formed from the six zones of arrival of pulses from the generator 34 clock pulses at all outputs of control unit 18 is zero. The keys 3, 4, 5, 6, 7, 8 ff are open, since their control inputs contain a low potential from the outputs of group 10 of logic circuits 2I. The pulse from the first output of the control unit 18 is fed to the input of the distributor 12. The high potential from the output of the distributor 12 permits the passage of a pulse from the second output of the control unit 18 through a group of 10 logic circuits 2I to the keys 3, 8. Coils of inductance L1 and L3, source 9 constant voltages, closed switches 3, 8 and differential transformer 13 form a measuring circuit. The measurement of the angular displacement occurs in six clocks, each of which begins with the arrival of a pulse from the generator 34 clocks in the control unit 18. In the first cycle, the keys 3 and 8 are locked, in the second - keys 4 and 7, in the third - keys 6 and 7, in the fourth - keys 5 and 8, on the fifth - keys 4 and 5, in the sixth - keys 3 and 6. In each measure at the ends (About Put.f

Description

The winding ptorder of the differentiating transformer 13 forms a bell-shaped, consistent impulse impulse with an amplitude proportional to the relative imbalance of the two inductive | gay and (L - Li;) / (L + Lii), where L ,, -,

392350

L.j inductors connected to the differentiated transformer 13 in the i-M cycle. The relative unbalance inductance is determined by the angular position of the shaft 2 of the inductive sensor 1. 1 Cp f-ly, 9 ill.

eleven

I.

I The invention relates to measuring techniques, in particular, devices for measuring angular displacements.

; The purpose of the invention is to expand the range of measured angular displacements and decrease the relative error of the device, which is achieved due to the fact that the calibration characteristic of the device is formed of six zones.

Figure 1 shows the structural diagram of the proposed device; figure 2 - sensor; FIG. 3 shows plots measuring inductances of the sensor coils from the angular displacement of the shaft; Fig. 4 shows graphs of the change in the ratio of the difference between the inductances of the sensor coils and the sum of the IC from the angular displacement of the shaft; FIG. 3 shows plots of the output signal of the digital squaring device 20 as a function of the angular displacement of the shaft (for six interrogation cycles); 6 shows time diagrams of the output pulses of the control unit 18 and the distributor 12; 7 shows the truth table of the converter of 29 codes; on Fig diagram of the Converter 29 codes; Fig. 9 is a diagram of a control unit 18.

The device contains an inductive sensor 1 with three inductors L

one

L, j and L 3,

connected to shaft 2, keys 3-8, constant voltage source 9, group 10 of logic circuits 2I, group of 11 disjointrs, distributor 12, differential transformer 13, paraphase amplifier 14, time selector 15, amplitude detector 16, analog -digital converter 17, control unit 18, read-only memory 19, digital comparator

0

five

20, data registers 21-26, coincidence circuit 27, register of indications 28, code converter 29, multiplexer 30, region number register 31, result register 32, bus coupler 33, and clock generator 34.

The inductors L and L are connected to the output of a constant voltage source 9 at one end, the second terminal L is connected to the information

the key 3, the second output L is connected to the information input of the key 6, the output of the key 3 is connected to the first output of the primary winding of the differentiating transformer 13, the output of the key 6 is connected to the second output of the primary winding of the differentiating transformer 13, taps from the middle of the primary and secondary windings of the differential transformer 13 are connected to the ground bus; the secondary windings of the differentiating transformer 13 are connected to the inputs of the paraphase amplifier 14, the output of which is connected to the input of the time selector 15, the output of the time selector 15 is connected to the input of the amplitude detector 16, the output of which is connected to the input of the analog-digital converter 17, to the control input of which a pulse is received. Starting from the fourth output of control unit 18, and from the fifth output of control unit 18, pulse is reset to the control input of the amplitude detector 16, the third output of the control unit 18 is connected to the control input of the time selector 15, the second output of the control unit 18 is connected to the first inputs of the group 10 of logic circuits 2I, the second inputs Upps 10 logic circuits 2I are connected to the outputs of a group of 11 disjunctors, the outputs of a group of 10 logical

0

0

Circuits 2I are connected to control inputs of keys 3-8.

The inductor L is connected by the first output. With the output of the source 9 of the constant voltage, the second output LJ is connected to the information inputs of the keys 7 and 8, the information input of the key 4 is connected to the information input of the key 3, the information input of the key 5 is connected to the information input of the key 6, the outputs of the keys -4 and 8 are connected to the transmitter 2 of the primary winding of the differentiating transformer 13, the outputs of the switches 5 and 7 are connected to the first output of the primary winding of the differential transformer 13, the outputs of the analog-digital converter 17 The first group of inputs of a digital comparator 20 is connected to the data inputs of data registers 21–26, the second group of inputs of a digital comparator 20 is connected to the outputs of a permanent storage device 19, the output of a digital comparator 20 is connected to the input of a register of 28 signs, the outputs of which 29 codes are connected to the converter inputs, 29 code converter outputs are connected to the information ones. the inputs of the register 31 of the zone number, as well as with the address inputs of the multiplexer 30, the information inputs of which are connected to the outputs of the data registers 21-26, the outputs of the multiplexer 30 are connected to the information inputs of the result register 32, the control inputs of the result register 32 and the register number 31 connected to the output of the coincidence circuit 27, one input of which is connected to the output of the distributor 12 of the distributor 12, the other with the seventh input of the control unit 18, the outputs of the field connector 33 are connected to the corresponding control inputs Registers 21–26, data, a group of inputs of the busbar of conjugator 33 are connected to the outputs of the decoder of the distributor 12, and a strobing input — to the sixth output of the control unit 18, which is also connected to the control input of the 28 signs, the outputs of the decoder of the distributor 12 are also connected to the inputs of a group of 11 disjointrs, and the outputs of the distributor counter 12 to the address inputs of a permanent storage device 19. Generator output

Q 5 20 25 out of others ds

35

50

five

34 clock pulses are connected to the input of control unit 18.

The device works as follows.

The measurement of the angular displacement begins from the moment of arrival of the pulse from the generator 34 of clock pulses to the input of the control unit 18.

Prior to the arrival of the pulse from the generator 34 clock pulses at all outputs of the control unit 18 there is a zero level. The keys 3-8 are open, so there is a low potential on their control inputs, which from the second output of the control unit 18 through the group 10 of logic circuits 2I goes to the control inputs of the keys 3-8.

The impulse from the first output of the control unit 18 is fed to the counting input of the distributor 12, which consists of a counter modulo six, a decoder for 6 and a circuit for presetting the counter when the power is turned on. The outputs of the counter are connected to the inputs of the decoder. When the supply voltage reaches the nominal value in the preset circuit, a pulse is generated in which the meter of the distributor 12 is set, for example, to state 101.

The impulse received by the counting input will transfer the counter to the state. 000, At the output of the decoder, Vits has a high potential, which is fed to the inputs of two of a group of 11 disjunctors and passes to their outputs. The high potential permits the passage of a pulse from the second output of the control unit 18 through two of the group 10 of the logic circuits 2I. The pulse from the second output of the control unit 18 passes. to keys 3 and 8. Keys 3 and 8 are closed with - for a time equal to the pulse duration from the second output of control unit 18. Inductors L and LJ, constant voltage source 9, closed switches 3 and 8, and differentiating transformer 13 form a measuring circuit.

At the ends of the secondary winding of the differentiating transformer 13, a bell-shaped pulse is formed, the amplitude of which is proportional to the relative imbalance of the two inductances (in particular, L. and L). The dependence of the amplitude of the signal on the secondary winding is differentiated

the transformer 13 on the angular displacement of the shaft 2 will repeat the dependence of the relative unbalance of these influences (Fig. Ad). In a paraphase amplifier 14, the signal is scaled. At the output of the temporary selector 15 passes the area adjacent to the first maximum of the signal. On the capacitance of the detector 16, the maximum of the signal from the output of the time selector 15 is stored. The amplitude of the maximum is converted into a binary code into an analogue | GO-digital converter 17. The binary code from the analog-digital converter 1 is recorded in one of the | of data registers 21-26 and compared in a digital comparator 20 with a binary | low code (for example, zero J from an unallocated storage device 19.2o | After setting the result, compared to | the output of the digital comparator | 20 to impulse from the sixth output of the result control block 18 The comparison is recorded in the register of 28 signs, 25: which is executed, for example, as a six-bit shift register with a serial information input.

The first measure of the measurement of the angular shifting is complete.

The measurement of the angular displacement occurs in six cycles. Each clock cycle begins with the arrival of a pulse from the clock pulse generator 34 to the control unit 18. In the second — necks, the same events occur as in the first cycle, two of the six keys 3–8 are closed in each cycle. In the first cycle, the key is closed (chi Zi8, keys 4 and 7 in the second cycle, keys 6 and 7 in the third cycle, keys 5 and 8 in the fourth cycle, keys 4 and 5 in the fifth cycle, and keys in the sixth cycle 3 and 6.

45

In each cycle, at the ends of the secondary winding of the differentiating transformer 13, a bell-shaped voltage pulse is formed with an amplitude proportional to the relative unbalance of the two inductances

and .. LiilbJL,

Lb + I-j, where. j, - - inductors.

connected to a differentiated transformer 13 via closed keys in the i-OM cycle.

13923506

The relative density of inductances is determined by the angular position of the shaft of the inductive sensor.

KoHiu i the secondary winding of the differentiating transformer 13 is connected to the inputs of a paraphase amplifier

14. From the output of the paraphase amplifier 14, the bell-shaped voltage pulse is applied to the time selector.

15, the output of which passes the maximum of the bell-shaped pulse with the adjacent area.

At the output of the amplitude detector 16, a quasi-constant voltage is formed, the amplitude of which is equal to the amplitude of the bell-shaped voltage pulse. The voltage from the output of the amplitude detector 16 is fed to the input of the analog-to-digital converter 17, where it is digitized and represented by the binary code N., The result of the conversion N. is written to one of six data registers 21-26, because There is only one write pulse on the bus driver 33 outputs. The result of the conversion also goes to the first input bus of the digital comparator 20, the second input bus receives the constant Ay from the permanent storage device 19, the address on the PC hundred only memory device 19 enters the distributor 12 with the counter outputs,

At the output of the digital comparator 20, an output signal is generated, defined by the ratio of the result of the converter with the constant A-. If N (A ,, then the output signal of the comparator is O, and when NJ 77A-X. 1. The results of comparing for the case

AI A2 AZ 4 5 6 are sequentially recorded in the register of 28 signs on the control pulse from the sixth output of the control unit 18.

A parallel binary code is fed to the converter inputs 29 from the register outputs of 28 signs, to which the result is written: from a digital comparator 20. The results are accumulated for six measuring cycles in the register of 28 signs.

In the entire working range, six subranges (zones) of 60 each can be distinguished. Each zone corresponds to a specific code that is written to pe40.

Gistr 28 signs. By the end of the sixth cycle of the measurement cycle, one of the combinations X, X, X can appear at the inputs of the converter of 29 codes;

4 f t

At the output of the converter 29 codes, a binary code with weights A-2-1, the digital equivalent of which corresponds to the zone number, will be generated. The zone number code is recorded in the zone number register 31, and is also used to control the operation of the multiplexer 30.

The conversion result, stored in one of the six data registers 21-26, corresponding to the zone number, is transmitted by the multiplexer 30 to the inputs of the result register 32 and is written to it. Information is written to the result register 32 and the zone number register 31 is carried out by the arrival of a pulse from the output of the matching circuit 27. The write pulses to the data registers 21-26 are obtained by combining the pulses of the decoder 12 decoder bus and the pulse from the sixth output of the control unit 18. On the output bus of the counter of the distributor 12. The number i of the cycle, expressed in binary code, is set, on the bus of the decoder the pulses D1 - Db are formed. The decoder decoder bus 12 is connected to the inputs of a group of 11 disjointrs, as well as to the inputs of a bus conjuncer 33. At the outputs of a group of 11 disjunctors, pulses are generated that allow the passage of pulses from the second output of the control unit 18 through the group 10 of logical diagrams 2I to the control inputs of keys 3-8, each of which in the measurement process must be closed in two cycles, which is ensured by the appearance of pulses at the permitting inputs of a group of 10 logical circuits 2I from the outputs of a group of 11 disjunctors.

The impulse from the third output of the control unit 18 goes to the time selector 15. At the fourth output of the unit

18, a pulse is generated that triggers the analog-to-digital converter 17 upon completion of the conversion, in which the sixth output of the control unit 18 is a pulse, which is used to write 28 signs to the register, and the conversion results to data registers 21-26 . At the seventh exit block 18

0

five

5 5 0 5 0 5

oh

The control pulse appears after setting the output of the converter 29 for the binary code of the zone number to 29 and passing to the output of the result multiplexer 30 from the corresponding data register 2-26. On the impulse from the seventh output of the control unit 18, the number of the zone and the result register 32 are written to the register 31.

The result of the measurement of the angular displacement is stored in the register 31 of the zone number and in the register 32 of the result.

Claims (2)

1. Device for measuring angular displacements, comprising a differential inductive angular displacement sensor with two inductors, a constant voltage source, two keys, a differentiating transformer, a paraphase amplifier, a time selector, an amplitude detector with reset circuits, an analog-to-digital converter, a unit control, a group of logic circuits 2I, a distributor and a clock pulse generator, the inductors are connected to the output of a constant voltage source at one end, the second output The first inductive coil is connected to the information input of the first switch 5, the second output of the second inductor is connected to the information input of the second switch, the output of the first switch is connected to the first output of the primary winding of the differentiating transformer, the output of the second switch is connected to the second output of the primary winding of the differential transformer, taps from the middle the primary and secondary windings of the differentiating transformer are connected to the ground bus, the conclusions of the secondary winding of the differential transformer Pa connected to the inputs of the paraphase amplifier, the output of which is connected to the input of the time selector, the output of the time selector connected to the input of the amplitude detector, the output of which is connected to the input of the analog-digital converter, the control input of the analog-digital converter connected to the fourth output of the control unit, n the control unit's output is connected to the control input of the amplitude detector, the third output of the control unit is connected to the control input I of the time selector, the second output i of the control unit connected to the first; inputs of a group of logic circuits 2I, outputs of a group of logic circuits 2I connected to the control inputs of the first and second keys, the first output of the control unit is connected to the input of the distributor, the input of the control unit is connected to the output of the clock generator, which , in order to expand the range of measured angular displacements and improve the accuracy of the device, four keys, a group of disjointrs, a permanent storage device, a digital comparator, six data registers, a circuit are entered into it. matches, feature register, code converter, multiplexer, zone number register, result register, bus conjugator, third inductor, one output of which is connected to the output of a constant voltage source, and the other output to information inputs of the fifth and sixth keys, information the input of the third key is connected to the information input of the first key; the information input of the fourth key is connected to the information input of the second key; the output of the third and sixth keys is connected to the second output: the primary winding of the trans the formatter, the outputs of the fourth and fifth keys are connected to the first output of the primary winding of the transformer, the control inputs of the third, fourth, fifth, sixth keys are connected to the outputs of a group of logic circuits 2I, the outputs of the analog-digital converter are connected to the first group of inputs of the digital comparator, and also with the information inputs of six data registers, the second group of inputs of the digital comparator is connected to the outputs of the permanent storage device, the output of the Digital Comparator is connected to the input of the register when Nakov, the outputs of which are connected to the inputs - transcoders outputs transformations 0 five 0 five 0 five 0 The code generator is connected to the information inputs of the register of the zone number, as well as to the address inputs of the multiplexer, the information inputs of which are connected to the outputs of the data registers, the outputs of the multiplexer are connected to the information inputs of the result register, the control inputs of the result register and the register of the zone number are connected to the output of the coincidence circuit, one input of which is connected to the output of the distributor decoder, and the other to the seventh output of the control unit; the outputs of the muddy conjunctor are connected to the corresponding the control inputs of the data registers, the bus terminal of the conjuncer is connected to the outputs of the distributor decoder, the gate of the sixth output of the control unit that is connected to the control input of the register of attributes, the outputs of the distributor of the distributor are connected to the inputs of the group of disjunctors, the outputs of the counter of the distributor of the distributor a fixed storage device, the outputs of a group of disjunctors are connected to the second inputs of a group of logic circuits 2I. 2. A device according to claim, characterized in that the inductive sensor is made in the form of two coaxial glasses with overlapping ;; raster windows, located one in another, and three fixedly mounted inductors, on the inner glass under each of the inductors there are raster windows with an angular size of 120 and angle shift relative to the outermost window of 120 ° under the second coil, and angle shift of 240 under the third coil, on the outer glass, the raster windows under the inductors are made with an angular size of 120 ° and without shifting relative to each other, the inner glass is fixed on the shaft and is rotatable around the cBoeii axis, Both glasses are made of non-magnetic electrically conductive material. about L2 t 14h uchusiu 8-8 , 2raE 560 .d Phi. 360 i /; hail 60 120 190 2W tons ЬО f, 2pad FIG. five xoS at 4f lg. A6 I s t well PC P P P P P P F I 6 FIG L